Ambrose

It is not only of the space in the Church which we ought to be jealous, but also of the interiors of the house of God in us, so that it might not become a house of merchandise, or a den of robbers.

If you are at Rome, live in the Roman style; if you are elsewhere, live as they live there.

Saint Ambrose, Latin: Sanctus Ambrosius, "Ambrosius episcopus Mediolanensis"; Italian: Sant'Ambrogio; Lombard: Sant'Ambroeus) (c. 340 – 4 April397), bishop of Milan (Mediolanum in Latin), was one of the most eminent bishops of the 4th century. Together with Augustine of Hippo, Jerome, and Gregory I, he is counted as one of the four doctors of the West of antique church history.

Formerly a lamb was offered, a calf was offered. Christ is offered today...and he offers himself as priest in order that he may remit our sins: here in image, there in truth where, as our advocate, he intercedes for us before the Father.

De officiis ministrorum ("On the Offices of Ministers" or, "On the Duties of the Clergy"), Book I, ch. 48.[1]

Alternate translation: In old times a lamb, a Calf was offered; now Christ is offered. But He is offered as man and as enduring suffering. And He offers Himself as a priest to take away our sins, here in an image, there in truth, where with the Father He intercedes for us as our Advocate. [3]

And what else did John have in mind but what is virtuous, so that he could not endure a wicked union even in the king's case, saying: "It is not lawful for thee to have her to wife." He could have been silent, had he not thought it unseemly for himself not to speak the truth for fear of death, or to make the prophetic office yield to the king, or to indulge in flattery. He knew well that he would die as he was against the king, but he preferred virtue to safety. Yet what is more expedient than the suffering which brought glory to the saint.

De officiis ministrorum ("On the Offices of Ministers" or, "On the Duties of the Clergy"), Book III, chapter XIV, part 89 as quoted in www.ewtn.com

But it is not only of the space in the Church which we ought to be jealous, but also of the interiors of the house of God in us, so that it might not become a house of merchandise, or a den of robbers.

Commentary on John 2:16, Exposition of the Psalms of David 118 (PL 15 1457B)